refactor: add Pagination class

packages/analytics/src/models/pagination.js

@@ -0,0 +1,42 @@
+/* eslint-disable lines-between-class-members */
+/* eslint-disable class-methods-use-this */
+// eslint-disable-next-line max-classes-per-file
+import mongoose from 'mongoose'
+
+class Pagination {
+  nextKey = null
+  itemsPerPage = 50
+
+  constructor(itemsPerPage = 50, nextKey = null) {
+    this.itemsPerPage = itemsPerPage
+    if (nextKey) {
+      this.nextKey = new mongoose.Types.ObjectId(nextKey)
+    }
+  }
+
+  limit() {
+    return { $limit: this.itemsPerPage }
+  }
+}
+
+export class Asc extends Pagination {
+  matchStage(field) {
+    const stage = this.nextKey ? { [field]: { $gt: this.nextKey } } : {}
+    return { $match: stage }
+  }
+
+  order(field) {
+    return { $sort: { [field]: 1 } }
+  }
+}
+
+export class Desc extends Pagination {
+  matchStage(field) {
+    const stage = this.nextKey ? { [field]: { $lt: this.nextKey } } : {}
+    return { $match: stage }
+  }
+
+  order(field) {
+    return { $sort: { [field]: -1 } }
+  }
+}